ESAB PCM-1125, Instruction Manual

Page: 35 / 72

5
5.6 TROuBleSHOOTINg
Check the problem against the symptoms in the following troubleshooting guide. The remedy may be quite simple. If the
cause cannot be quickly located, shut off the input power, open up the unit, and perform a simple visual inspection of all the
components and wiring. Check for secure terminal connections, loose or burned wiring or components, bulged or leaking
capacitors, or any other sign of damage or discoloration.
The cause of control malfunctions can be found by referring to the sequence of operations and electrical schematic diagram
(Figure 5-4) and checking the various components. A volt-ohmmeter will be necessary for some of these checks.
NOTE
Before checking voltages in the circuit, disconnect the power from the high frequency generator to avoid damaging your
voltmeter.
SeCTION 5 MAINTeNANCe
NOTE:
Schematics and Wiring Diagrams on 11” x 17”
paper are included
inside the back cover of this manual.
WARNINg
WARNINg
Voltages in plasma cutting equipment are high enough to cause serious injury
or possibly death. Be particularly careful around equipment when the covers
are removed.
eleCTRIC SHOCK CAN KIll! Be sure that all primary power to the machine has
been externally disconnected. Open the line (wall) disconnect switch or circuit
breaker before attempting inspection or work inside of the power source.